Anti-SLC9A4 antibodies are used in the immunodetection of the protein solute carrier family 9 member A4. In humans, the canonical protein has a reported length of 798 amino acid residues and a mass of 89.8 kDa. Its subcellular localization is in the cell membrane. It is notably expressed in the small intestine, rectum, colon, and appendix. A member of the Monovalent cation:proton antiporter 1 (CPA1) transporter (TC 2.A.36) protein family, SLC9A4 is known to be involved in pH regulation to eliminate acids generated by active metabolism or to counter adverse environmental conditions. Synonyms for this target antigen include NHE-4, Na(+)/H(+) exchanger 4, solute carrier family 9 (sodium/hydrogen exchanger), member 4, solute carrier family 9 member 4, and sodium/hydrogen exchanger 4. SLC9A4 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species. Some SLC9A4 antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, Immunohistochemistry is also a common application.